Quasi-static and high strain rate response of Kevlar reinforced thermoplastics

Polymer Testing

卷:93

Neelanchali Asija Bhalla¹  Hemant Chouhan²  Aswani Kumar Bandaru²  Naresh Bhatnagar²  Shishay Amare Gebremeskel³ 

[1] Corresponding author.;

[2] Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India;

[3] Marie Skłodowska-Curie Career-FIT Fellow, Irish Centre for Composites Research (IComp), School of Engineering, University of Limerick, Ireland;

关键词: Kevlar;    Thermoplastic matrices;    Quasi-static;    High strain rate;    Failure mechanisms;   

DOI  :  

来源: DOAJ

【 摘 要 】

The present study deals with the quasi-static and high strain rate characterization of Kevlar-129 based thermoplastic composites. Two different thermoplastic matrices, namely, Polypropylene (PP) and Polyetherimide (PEI) were used to manufacture composite laminates. Quasi-static compression tests were performed at strain rates of 0.041 s−1 and 0.045 s−1. High strain rate tests were performed using a split Hopkinson pressure bar apparatus within the strain rates ranging from 2548 s−1 to 4379 s−1. Stress-strain relations reveals the rate-sensitive behaviour of composites. Kevlar/PP (K-PP) showed higher peak stress under quasi-static loading as compared to the high strain rate test. Comparable peak stresses were revealed under quasi-static and high strain rate loading for Kevlar/PEI (K-PEI) composite. Also, high strain rate compression properties such as peak stress, peak strain and toughness of K-PP were 25%, 27% and 6% higher than that of the K-PEI composite. The failure mechanisms of both the composites were characterized through macroscopic and scanning electron microscopy. K-PP failed majorly due to matrix crush and fibre failure while K-PEI failed due to shear cracking. Damage study reveals that a single fibre based composite system can be tailored to act as an energy-absorbing or dissipating material system by varying the thermoplastic matrix materials.

【 授权许可】

Unknown